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What is a JIS B1183 Type 3 Acorn Nut?
JIS B1183 Type 3 acorn nuts are metric hexagon domed cap nuts designed to cover and protect exposed bolt or stud threads. The closed-end design helps protect exposed threads from dirt, moisture, and damage while also providing a clean, finished appearance.
The low-height Type 3 design is particularly useful where installation space or clearance is limited. These acorn nuts are designed for use with compatible metric coarse-thread bolts, screws, and studs and can be installed using a standard metric wrench. They are also known as dome nuts, hexagon domed cap nuts, closed-end nuts, and cap nuts.
What finishes are available for JIS B1183 Type 3 Acorn Nuts?
These JIS B1183 Type 3 acorn nuts are available in zinc plated steel and chrome plated steel. Zinc plating provides corrosion resistance and a practical finish for general industrial and mechanical applications, while chrome plating provides a bright, polished appearance along with corrosion resistance, making it particularly attractive for visible hardware and finished assemblies.
Both finishes retain the strength and durability of the underlying steel construction while providing protection against rust and oxidation.
Why choose a Low-Height JIS B1183 Type 3 Acorn Nut?
The low-profile design of these acorn nuts provides the thread protection and finished appearance of a standard acorn nut while requiring less vertical clearance. The enclosed dome covers the exposed end of the bolt or stud, helping protect threads while reducing the risk of contact with sharp protruding threads.
The choice between zinc plated and chrome plated allows the finish to be matched to the application. Zinc plating is well suited for general-purpose fastening, while chrome plating is an excellent option when a bright decorative appearance is desired.
Where are JIS B1183 Type 3 Acorn Nuts commonly used?
JIS B1183 Type 3 low-height acorn nuts are commonly used in automotive assemblies, motorcycles, Japanese equipment, machinery, furniture, architectural hardware, electrical equipment, appliances, agricultural equipment, and general OEM manufacturing.
Their compact profile makes them particularly useful for space-restricted assemblies, exposed fasteners, equipment covers, brackets, guards, and decorative hardware where protecting exposed threads and maintaining a finished appearance are important.
